Who vs Whom: Simple Rule with Examples for B1-B2 Learners

Introduction

Knowing when to use who and when to use whom can feel like a grammar puzzle. Many learners (and even native speakers!) avoid whom because it sounds formal or confusing. But don’t worry—once you learn one simple trick, you will never mix them up again. In this post, you will discover a foolproof method, see plenty of examples, and practice until it feels natural.

What Is the Difference Between Who and Whom?

Both who and whom are question words and relative pronouns. The key difference is their role in a sentence:

• Who is used as a subject (the person doing the action).
• Whom is used as an object (the person receiving the action).

Think of it like this: who works like he/she/they, and whom works like him/her/them.

Rules

Follow these three simple rules to choose correctly every time.

1. Identify the verb: Find the main verb in the clause that contains the who/whom question.
2. Ask yourself: Is the person doing the action (subject) or receiving the action (object)?
3. Substitute with he/him: If you can replace the word with he, use who. If you can replace it with him, use whom.

How to Use It: The He/Him Trick

This is the easiest method for B1-B2 learners. Follow these steps:

1. Look at the clause where who or whom appears.
2. Rewrite the clause as a simple sentence, replacing the person with he or him.
3. If he sounds correct, use who. If him sounds correct, use whom.

Example 1: “____ wants to join the club?”

• Rewrite: “He wants to join the club.” (not “Him wants”)
• Answer: Who wants to join the club?

Example 2: “____ did you invite to the party?”

• Rewrite: “You invited him.” (not “You invited he”)
• Answer: Whom did you invite to the party?

Example 3: “The woman ____ lives next door is a doctor.”

• Rewrite: “She lives next door.” (not “Her lives”)
• Answer: The woman who lives next door is a doctor.

Example 4: “The man ____ I met yesterday is my boss.”

• Rewrite: “I met him yesterday.” (not “I met he”)
• Answer: The man whom I met yesterday is my boss.

Examples in Sentences

Here are 12 sentences that show correct usage. The grammar point is bolded.

• Who called you last night?
• Whom should I contact for technical support?
• She is the teacher who inspired me to study English.
• He is the colleague whom I admire most.
• Do you know who broke the window?
• To whom did you give the report?
• My brother, who lives in Canada, is visiting next week.
• The artist whom we hired painted a beautiful mural.
• Who is responsible for this project?
• I wonder whom they chose as the winner.
• The driver who caused the accident was unhurt.
• The guests, most of whom were from Europe, arrived early.

Common Mistakes

Even advanced learners make these errors. Here are the most frequent ones, with corrections.

• ❌ Whom is coming to dinner?
  ✅ Who is coming to dinner? (Because “He is coming” → who)
• ❌ Who did you see at the mall?
  ✅ Whom did you see at the mall? (Because “You saw him” → whom)
• ❌ She is the person whom runs the company.
  ✅ She is the person who runs the company. (Because “She runs” → who)
• ❌ To who should I address this letter?
  ✅ To whom should I address this letter? (Because “to him” → whom)
• ❌ I know a singer whom writes her own songs.
  ✅ I know a singer who writes her own songs. (Because “She writes” → who)

Quick Summary

• Who = subject (like he, she, they).
• Whom = object (like him, her, them).
• The he/him trick works almost always.
• When in doubt, ask: “Can I answer with he or him?”
• In informal English, many people use who for everything, but for exams and formal writing, use the correct form.

Practice Exercises

Fill in the blank with who or whom. Answers are below.

1. ______ ate all the cookies?
2. ______ did you send the invitation to?
3. She is the friend ______ always supports me.
4. The musician ______ we saw last night was amazing.
5. ______ is the author of this book?

Answers:

1. Who (He ate → who)
2. Whom (You sent to him → whom)
3. Who (She supports → who)
4. Whom (We saw him → whom)
5. Who (He is the author → who)

Conclusion

Now you have a clear, simple rule for using who and whom correctly. Remember the he/him trick, and you will avoid the most common mistakes. Practice with real sentences, and soon it will become second nature. For more grammar guides and exercises, explore other posts on EnglishGrammarZone.com.

FAQ

1. Is “whom” still used in modern English?
Yes, especially in formal writing, academic contexts, and on exams like TOEFL or IELTS. In everyday casual conversation, many native speakers use “who” instead of “whom,” but knowing the correct form is important for professional and academic English.

2. What is the easiest trick to remember the difference?
The best trick is the he/him substitution. Replace the word with “he” or “him.” If “he” fits, use “who.” If “him” fits, use “whom.” For example: “____ is there?” → “He is there.” → “Who is there?”

3. When do I use “whom” after a preposition?
After prepositions like to, for, with, by, from, you should use “whom.” For example: “To whom did you speak?” or “With whom are you going?” In informal English, people often move the preposition to the end and use “who,” but formal grammar requires “whom.”

4. Can “whom” be the subject of a sentence?
No, never. “Whom” is always an object. If the word acts as the subject (the person doing the verb), you must use “who.” For example: “Who wrote this letter?” (subject) vs. “Whom did you write to?” (object).